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ASL5015FHN 数据表(PDF) 42 Page - NXP Semiconductors |
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ASL5015FHN 数据表(HTML) 42 Page - NXP Semiconductors |
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42 / 69 page  NXP Semiconductors ASL5xxxyHz Matrix LED Controller (MLC) ASL5xxxyHz All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved. Product data sheet Rev. 2.1 — 5 February 2019 42 / 69 The microcontroller can put the entire Matrix LED Controller to sleep with a single broadcast message: • CAN message for Sleep mode (Broadcast): (Partial Networking must be deactivated) • Command = 41 • DLC = 000 (no data in the CAN message) This command is ignored only if the MLC is in Limp Home mode state. All the MLCs go to sleep when they receive this broadcast message, but the CAN controller continues watching the bus and in case any change occurs in the CAN bus, the CAN controller wakes up the MLC immediately. In Sleep mode, the MLC consumes less than 1.35 mA. In case the system has MLCs in sleep and others in the same bus in wake (Partial Networking), refer to Section 13 "Partial networking for Sleep and Wake Up (message based)". Send a message to refresh the Limp Home mode watchdog timer (register 3Ch) right before sending the MLCs to sleep. Refreshing the timer this way avoids reaching the timeout setting during the send-to-sleep process. During sleep mode, the watchdog timer to enter in Limp Home mode in case of communication failure is stopped and refresh action is not required during this mode. Any watchdog refresh action from the microcontroller during Sleep mode wakes up the MLCs. If the MLC wakes up due to a noise in the CAN bus, the MLC returns to sleep, in case it does not receive any message in the period of the maximum value of the watchdog timer (576.7 ms). In this case, the MLC does not enter the Limp Home mode state, but returns to sleep mode. The MLC wakes up only if the microcontroller orders it to do so. A synchronization action must be performed in the bus after waking them up. The synchronization is done by sending three consecutive messages from the microcontroller with no data on them (dummy-trimming message). The preamble of these messages is used to trim the CAN clock and synchronize all the MLCs in the bus. A broadcast trimming action is done to be sure that all the MLCs are synchronized and able to send information to the microcontroller. 13 Partial networking for Sleep and Wake Up (message based) In both messages, Sleep and Wake Up in partial networking, each bit of the bytes of the data field of the CAN message is linked to an MLC. See Table 33. The partial networking control messages, for Sleep or Wake Up, always has 4 bytes of data, the same 32 bits. Due to the address pins (5, from A0 to A4) of the MLC, up to 32 MLCs in the same CAN bus can connect. For that reason, the number of bits in the message fits with the maximum number of MLCs that can be in the same Bus. These two messages are always broadcast and the MLCs receive the messages whether the MLCs are in normal operation or in sleep mode. These messages are ignored only if the MLC is in Limp Home mode. In both cases, the MLC reacts only to the bit that is linked with its address. For example, the MLC with address 0 reacts to the first bit of the first byte of the message, or what is the same, it reacts to the value of the MS bit of the first byte. See Table 33. If the bit is 1, the MLC goes to sleep, in case the message is intended to send the MLC to sleep, or wakes up the IC, in case the message is intended for this action. Table 33 describes the distribution of the MLCs in the different bytes of the massages. |
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